Lets play a game. Let's relaunch the Legion, but you can only choose one thing about one character from previous continuity for the new mix. It can be anything as long as its just one character, and not something like "just use all the current versions".
My pick is they use the Valor version of Mon El. Was a hero briefly in the 21st century and a member of LEGION. Also seeded a lot of the world's that latter went on to firm the core of the UP, and is seen as almost a religious figure on those worlds.